A huge muff on either a male or a female.
"Man, did you see Nicole's muffle monster?"
-or-
" `70's porn has a lot of muffle monsters in it"
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A person who is a goof, pissing you off, or just a name that comes out of your mouth when you're short for combacks.
Kelly: "You're gay"
Caitlin: "You're such a dick daddy!"
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